Networking: Change of existing Domain Controller

This is an enterprise network. There is a domain controller (It is still at Windows 2003 server; it also functions as DNS server, DHCP server); There is an exchange server (It is at Exchange 2003); There is a File Server (It is a Windows 2003 server); and around 30 workstations and laptops (All with XP). The private IP is 192.168.51.0/24
-The IP for Domain Controller is 192.168.51.10
- The IP for Exchange Server is 192.168.51.20
- The IP for File Server is 192.168.51.12
- All the client machines get the IP address from DHCP server

The Planning:
- The Operating system of the Domain Controller will be changed using Windows 2008 server
- Exchange 2003 will be changed to Exchange 2007
- Leave the File Server with windows 2003 server
- Some clients would be changed to Win 7

The Condition:
- The existing daily operation should not be disturbed (as maximum as possible)

The things that I will do:
- Setup a new machine with windows 2008 server (I use the available IP of 192.168.51.9; make this machine as a Replica Domain Controller of the Existing one; make this machine also as a “Master DNS” server)
- If everything goes well, I can take out the existing domain controller (with the windows 2003 server) from the network
- Then, I will configure the DHCP server (at the new domain controller with Windows 2008 server)
- My assumptions: I do not do any change of configuration at the router at all

My Questions: Does the above approaches correct or wrong? Please provide some comments

tjie,
Your overall approach is good. Since you're upgrading a 2003 Domain Controller, you will need to copy a couple of scripts from Server 2008 DVD/ISO to your Server’s hard disk and then run adprep/FORESTPREP

Your overall approach is good. Since you're upgrading a 2003 Domain Controller, you will need to copy a couple of scripts from Server 2008 DVD/ISO to your Server’s hard disk and then run adprep/FORESTPREP and adprep/DOMAINPREP.
DHCP can be exported and imported if you have many entries, modify TTL time before migrating it.

Exchange: you can migrate from 2003 to 2007, don't upgrade. Create 2 servers in the same organization and move all mailboxes. You may have to change the IP address for exchange 2007 after the migration is completed in order not to change router's config.

This is the first one of a series of articles I’ll be writing to address technical issues that are always referred to as network problems. The network boundaries have changed, therefore having an understanding of how each piece in the network puzzl…

This tutorial will walk an individual through configuring a drive on a Windows Server 2008 to perform shadow copies in order to quickly recover deleted files and folders.
Click on Start and then select Computer to view the available drives on the se…

This tutorial will walk an individual through the process of configuring their Windows Server 2012 domain controller to synchronize its time with a trusted, external resource.
Use Google, Bing, or other preferred search engine to locate trusted NTP …